Composition Design and Corrosion Resistance of Mg Microallyed X70 Grade Acid Resistant Submarine Pipeline Steel (X70MOS)

doi:10.11902/1005.4537.2020.213

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (5): 617-624 DOI: 10.11902/1005.4537.2020.213

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Composition Design and Corrosion Resistance of Mg Microallyed X70 Grade Acid Resistant Submarine Pipeline Steel (X70MOS)

LANG Fengjun¹^,²^,³, HUANG Feng²^,³(

), XU Jinqiao³, LI Liwei³, YUE Jiangbo³, LIU Jing¹^,²

^1.The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
^2.Hubei Engineering Technology Research Center of Marine Materials and Service Safety, Wuhan University of Science and Technology, Wuhan 430081, China
^3.Baosteel Central Research Institute, Wuhan 430080, China

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Abstract

The corrosion rate of X70 submarine pipeline steel with alloying element addition in the so called NACE A medium and 3.5%NaCl solution was calculated by means of OLI analyzer studio software in order to simulate the corrosion situation of inner side and outer side of the real pipeline in service. Under the premise of ensuring the mechanical properties of X70 submarine pipeline steel, experimental X70MOS steels without and with 0.003% Mg-addition were designed and rolled. Then their corrosion resistance and hydrogen induced cracking (HIC) susceptibility were studied via electrochemical techniques in accord with NACE TM 0284-2016 standard. The results showed that corrosion rate of X70MOS steel with Mg-addition was lower than both that without Mg-addition and X70 submarine pipeline steel by 14.3% and 73.3% respectively in NACE A solution, and decreased by 52.8% and 80.4% respectively in 3.5% NaCl solution. The HIC susceptibility of the Mg-alloyed experimental steel with finely dispersed inclusions was lower than that of X70MOS steel without Mg-addition and X70 submarine pipeline steel. The development of X70MOS steel with 0.003% Mg-addition can enhance the corrosion resistance of the designed steel.

Key words: X70MOS steel Mg-treatment composition design corrosion resistance

Received: 27 October 2020

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(51871172);Central to Guide Local Technology Development Program(2018ZYYD026)

Corresponding Authors: HUANG Feng E-mail: huangfeng@wust.edu.cn

About author: HUANG Feng, E-mail: huangfeng@wust.edu.cn

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Cite this article:

LANG Fengjun, HUANG Feng, XU Jinqiao, LI Liwei, YUE Jiangbo, LIU Jing. Composition Design and Corrosion Resistance of Mg Microallyed X70 Grade Acid Resistant Submarine Pipeline Steel (X70MOS). Journal of Chinese Society for Corrosion and protection, 2021, 41(5): 617-624.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2020.213 OR https://www.jcscp.org/EN/Y2021/V41/I5/617

Fig.1 Electrochimical analysis system

Fig.2 Samples size (mm) and the illustration of related inspecting profile

Fig.3 Relation curves of Cu (a), Cr (b), Ni (c) and Mo (d) addition and X70 submarine pipeline steel corrosion rate

Table 1 Chemical compositions of three kinds of steel (mass fraction / %)

Table 2 Mechanical properties of three kinds of steel

Fig.4 Microstructures (a~c) and inclusions images (d~f) of 1# sample (a, d) , 2# sample (b, e) and 3# (c, f) sample steel

Fig.5 Statistics of type, quantity and size of inclusions in 1# sample (a), 2# sample (b), 3# (c) sample steel

Fig.6 Polarization curves of three kinds of steel in NACE A solution (a) and 3.5%NaCl solution (b)

Table 3 Polarization curve Tafel active zone fitting parameters and calculated corrosion rate

Fig.7 Nyquist curves of three kinds of steel in NACE A solution (a), 3.5%NaCl solution (b) and fitting circuit diagram of Nyquist curves (c)

Table 4 Fitting parameters of Nyquist curves of three kinds of steel

Fig.8 Photograph of HIC samples: (a) 1# sample, (b) 2# sample, (c) 3# sample

Fig.9 Morphology (a) and EDS pattern (b) of the cross profile under hydrogen bubbling

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